Measure Length with Inch Cubes
π§ Build a ruler! We can use little cubes that are exactly 1-inch long to measure anything. Just line them up end-to-end!
Do this: Read the concept below, then try the quiz or activity.
Concept
Before humans invented standardized wooden rulers, they used small objects to measure things. We can use "Inch Cubes" (blocks that are exactly 1 inch wide on all sides)!
π― The Measuring Rules: To measure a toy car with cubes: 1. Start perfectly at the edge: The first cube MUST start perfectly aligned with the front bumper of the car. No hanging off the edge! 2. End-to-end: The cubes must touch each other perfectly. No giant gaps! No overlapping onto each other! 3. Count the cubes: 1, 2, 3, 4, 5. The car is 5 cubes long!
Because each cube is 1-inch long... the car is 5 inches long!
Try it
Line up the cubes!
Instructions: Look at the picture (or imagine it) and count the perfectly lined up cubes.
Problem 1: A picture of a pencil has perfectly connected inch-cubes lined up beneath it. There are 6 cubes. * How long is the pencil? ___ inches.
Problem 2: You want to measure a book. You line up 9 inch-cubes, but there is a big gap between cube 4 and 5. * Is this a correct measurement? (Yes / No)
Problem 3: A toy lizard is exactly the same length as a train of 12 inch-cubes. * How long is the lizard? ___ inches.
Problem 4: You measure a leaf with cubes. The first cube starts exactly at the stem, and the 4th cube ends exactly at the tip. * Length: ___